Musicians Institute has many sub-departments, They have VIT, KIT, PIT, BIT, most probably you'll head for GIT (Guitar Institute of Technology). Basing on what i heard about one of their popular students, PAUL GILBERT, well, he's much more open minded now compared to what he's done in the past. He's trying a lot of different chordal voicings now, but limited only to his instrument, which is the guitar.
Berklee College on the other hand makes you more than a complete musician. A very outstanding student of theirs is my #1 idol, STEVE VAI. if you pay particular attention to his arrangements, it doesn't just satisfy the guitars. keyboard-wise, drum-wise & the bass lines as well are very challenging. and take note, "He wrote them note for note". That's why a lot of musicians dont stay long in his band, because he's a control freak. The guitarist, bassist and drummer for the band Dream Theater went to Berklee also, but after their first year, they stopped schooling & pursued their music careers. but look at where they are now. all i know is that Berklee has a more demanding requirement than Musicians Institute. You need to submit a demo of your music, either original or cover. but that would pass through the most scrutinizing ears in Berklee. I know a person who passed the demo, anybody out there knows Enoz Vergara's son, Tom from bayanihan village in basak? he did a cover of Chick Corea's "Spain", that even Chick Corea sent him a letter acknowledging him for his splendid rendition. the problem was, He had nobody to sponsor him to study in Boston.
So to sum up all my "yawyaw" GIT=good guitar player
Berklee=very good guitar player+knows how to arrange for different instruments+you care for the other instruments, not only the guitar
GOOD LUCK ON YOUR QUEST!!!!! I hope i helped